Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f6385a8585596d…

MALICIOUS

PDF

40.6 KB Created: 2020-08-21 21:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f7ef010e84e862c07cb97841e66e180 SHA-1: c0acf36b4869a42a0da01c35105e6e7308a62a35 SHA-256: 13f6385a8585596d0f52ff23abe2c13b255dcdb7b258b10db22812e0d99df5cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=z+fold+brochure+template+publisher
    • http://files.trahk.org/uploads/1/3/0/8/130814003/dorik-futodosimasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/pubarojumosewenabukop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/is_nyannyancosplay_a_guy.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/tojowerexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/aspect_ewfm_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/rovoxogubiwofarijipipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/mepufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/79581047559.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/bike_race_apk_all_bikes_unlocked.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006339.bin
aac6a613c9c16da74fb025b9755baf00ebe0f00adc92d6d20220b6c2157acd85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6339 5492 bytes
font_01_sfnt_off000075be.bin
31720b59178e64b1f4e808fef01665920c6f5ef24b13439ea908bd7f69a4765c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BE 9560 bytes

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